31
T_C-IOM-2A
Start Up
Economizer Start-Up
ReliaTel Control
Using the Service Test Guide in Table 5,
momentarily jump across the Test 1 &
Test 2 terminals on LTB1 one time to
start the Minimum Ventilation Test.
ROTATING PARTS!
UNIT STARTS AUTOMATICALLY
Verify that the dampers stroked to the
minimum position.
ReliaTel Control
Momentarily jump across the Test 1 &
Test 2 terminals on LTB one addi-
tional time if continuing from previous
component start-up or until the de-
sired start-up component Test is
started.
Verify that the dampers stroked to the
full open position.
To stop the SERVICE TEST, turn the
main power disconnect switch to the
“Off” position or proceed to the next
component start-up procedure. Re-
move electro mechanical test mode
connections (if applicable).
Compressor Start-Up
1. Attach a set of service gauges onto
the suction and discharge gauge ports
for each circuit. Refer to the refrigerant
circuit illustration in the Service Facts.
ReliaTel Control
Using the Service Test Guide in Table 5,
continue the SERVICE TEST start-up
procedure for each compressor circuit.
Momentarily jump across the Test 1 &
Test 2 terminals on LTB1 one additional
time if continuing from previous compo-
nent start-up or until the desired start-up
component Test is started.
Scroll Compressors
a. Once each compressor has started,
verify that the rotation is correct. If a
scroll compressor is rotating back-
wards, it will not pump and a loud rat-
tling sound can be observed.
b. If the electrical phasing is correct, be-
fore condemning a compressor, inter-
change any two leads (at the com-
pressor Terminal block) to check the
internal phasing. Refer to the illustra-
tion in Figure 5-1 for the compressor
terminal/phase identification. If the
compressor runs backward for an ex-
tended period (15 to 30 minutes), the
motor winding can overheat and cause
the motor winding thermostat to open.
c. Check the compressor oil levels. The
oil level in each compressor sight
glass should be 1/2 to 3/4 full when
they are “Off”.
Note:
The scroll compressor uses Trane OIL-
42 without substitution. The appropriate
oil charge for a 9 and 10 Ton scroll
compressor is 8 pints. For a 14 and 15
Ton scroll compressor, use 14 pints ( 6.6
liters).
2. After the compressor and condenser
fan have started and operated for ap-
proximately 30 minutes, observe the
operating pressures. Compare the
operating pressures to the operating
pressure curve in the Service Facts.
3. Check system superheat. Follow the
instruction listed on the superheat
charging curve in the Service Facts.
Superheat should be within ±5 F (-15C)
of the superheat chart value.
4. Repeat steps 1 through 4 for each re-
frigerant circuit.
5. To stop the SERVICE TEST, turn the
main power disconnect switch to the
“Off” position or proceed to the next
component start-up procedure. Re-
move electro mechanical test mode
connections (if applicable).
Heating Start-Up
1. Clamp an amp meter around one of
1st stage heater power wires at the
heater contactor.
2. ReliaTel Control
Using the Service Test Guide in Table 5,
continue the SERVICE TEST start-up
procedure for each compressor circuit.
Momentarily jump across the Test 1 &
Test 2 terminals on LTB one additional
time if continuing from previous compo-
nent start-up or until the desired start-up
component Test is started.
3. Verify that the heater stage is operating
properly.
4. Clamp an amp meter around one of
2nd stage heater power wires at the
heater contactor (if applicable).
5. ReliaTel Control
Using the Service Test Guide in Table
5, continue the SERVICE TEST start-
up procedure for each compressor cir-
cuit. Momentarily jump across the Test
1 & Test 2 terminals on LTB one addi-
tional time if continuing from previous
component start-up or until the de-
sired start-up component Test is
started.
6. Verify that the heater stage is operat-
ing properly
7. To stop the SERVICE TEST, turn the
main power disconnect switch to the
“Off” position or proceed to the next
component start-up procedure. Re-
move electro mechanical test mode
connections (if applicable).
Summary of Contents for Precedent TSC060
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